2

Prolapse:
I think you got it right. Although you didn't provide your age or OB history I'll assume you are a bit older and have had children in which case this description sounds like a uterine prolapse. See your GYN doctor to confirm and advise you on a treatment that's right for you.
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4

Uterine prolapse:
You have not mentioned age , I am assuming more than 50 years, what you Harv is known as procidentia, complete uterine prolapse. You need to see a gynecologist. Definitive treatment for it is surgery. However they may give temporizing method like a pessary.
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6

Dependency:
This discharge is probably normal for third trimester pregnancy. The purple color of the vagina is probably due to congestion of blood in the vein walls of the vagina due to the weight of the infant and uterus bearing down on the pelvic floor, which increases during the third trimester.
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7

Needs exam:
It sounds like you are feeling a urethral diverticulum although an examination is needed to verify. An Obgyn should be able to look and feel what you are describing and determine the cause and treatment
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9

Limited effects:
Small varicose veins of the vaginal region with pregnancy are common. Larger varicose veins like you describe are uncommon. The veins have limited effect on a vaginal delivery. Early ambulation post delivery is important. Vaginal varicose veins maybe associated with large varicose veins in the pelvis, internal. This could result in increased bleeding with the need for a c-section delivery.
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